CN110937843A - Preparation process of concrete composite additive - Google Patents
Preparation process of concrete composite additive Download PDFInfo
- Publication number
- CN110937843A CN110937843A CN201911346426.1A CN201911346426A CN110937843A CN 110937843 A CN110937843 A CN 110937843A CN 201911346426 A CN201911346426 A CN 201911346426A CN 110937843 A CN110937843 A CN 110937843A
- Authority
- CN
- China
- Prior art keywords
- parts
- weight
- acrylic acid
- preparing
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation process of a concrete composite additive, belonging to the field of concrete materials and comprising the following steps: step 1, preparing modified acrylic acid; step 2, preparing nanometer powder; and step 3, mixing preparation. According to the invention, acrylic acid is chemically modified, and the nano filler is subjected to high-temperature solid-phase modification, so that various performances of cement are improved by utilizing the high polymer material and the nano material, the cement has more excellent workability and durability, and the water reducing property, the early strength property, the waterproof property, the antifreezing property and the expansion property are all obviously improved, therefore, the composite admixture provided by the invention is a very ideal concrete admixture.
Description
Technical Field
The invention discloses a preparation process of a concrete composite additive, belongs to the technical field of concrete materials, and particularly relates to a preparation process of foam concrete.
Background
The concrete admixture is an additive for improving the performance of concrete, and can obviously improve the performance of the concrete. Since the commercial concrete admixture is discovered in the 30 th of the 20 th century, the commercial concrete admixture is continuously developed and applied, and the development of the new-variety synthetic high-efficiency water reducing agent and the compound admixture with various properties successfully improves the performance of the commercial concrete and promotes the progress of the construction technology of the commercial concrete, and does not show the huge effect of the admixture. Due to the wide application and popularization of the admixture, the admixture has already become an indispensable fifth component in the mix proportion of commercial concrete, is characterized by multiple varieties and small mixing amount, plays an important role in improving the performance of newly-mixed commercial concrete and hardened commercial concrete, can be called as monosodium glutamate in the construction industry, can well play a role even if the use amount is small, and has certain effects which are difficult to achieve by other methods.
The commercial concrete admixture is used without special equipment and process, the method is simple and feasible, the commercial concrete admixture becomes an important measure for increasing the commercial concrete new variety, improving the yield and the quality, reducing the cost, improving the production operation and the service performance and improving the economic benefit, is an indispensable ring in the building engineering, and is another important leap of the commercial concrete development history after the reinforced commercial concrete and the prestressed commercial concrete.
The existing concrete admixtures are classified into four types according to functions: 1. an admixture for improving the workability of commercial concrete mixtures; 2. an additive for adjusting the setting time and the hardening performance of commercial concrete; 3. an admixture for improving the durability of commercial concrete; 4. and the additive can improve other properties of commercial concrete. Because the variety of the additives is more, certain inconvenience is caused to the use, and therefore, the composite additive is more and more popular to people as a multifunctional and convenient product.
The patent document CN 106477943A discloses a composite cement admixture which is prepared by mixing the following raw materials in parts by weight: 16-22 parts of calcium hydroxide, 10-16 parts of isopropanol, 8-12 parts of zinc chloride, 2-8 parts of 2-methyl-dodecane-5-one, 4-10 parts of dodecyl dimethyl betaine, 2-6 parts of lignosulfonate, 1-5 parts of alkyl succinimide, 6-10 parts of acetophenone, 2-8 parts of ammonium sulfate, 4-10 parts of tetrabutylammonium borohydride, 5-9 parts of palmitic acid and 6-12 parts of stigmasterol trienol.
Therefore, the composite additive comprises a plurality of components including sulfonate, alcohol, ketone and ammonium substances, has a certain effect of adjusting the comprehensive performance of the cement, including a certain seepage-proofing performance, but has small influence on the mechanical performance and the like of the cement, and the effect is not obvious.
Disclosure of Invention
The invention aims to overcome the defect of insufficient performance of the existing cement composite admixture, and the invention mainly obtains the composite admixture with multiple functions by adding modified high polymer materials and utilizing nano materials for modification.
The technical scheme is as follows:
a preparation process of a concrete composite additive comprises the following steps:
step 1, preparing modified acrylic acid: according to the weight parts, 35-55 parts of acrylic acid, 5-12 parts of methacrylic acid, 5-12 parts of maleic anhydride, 21-35 parts of ethylene oxide, 5-8 parts of glycerol, 5-10 parts of trimethylolpropane, 5-9 parts of isocyanate, 3-7 parts of methyl methacrylate and 5-15 parts of bisphenol A are put into a reactor, 2-5 parts of an initiator is added, water bath heating reaction is carried out for 3-6 hours, and modified acrylic acid is prepared after the reaction is finished;
step 2, preparing nano powder: putting 5-15 parts by weight of barium salt, 5-12 parts by weight of calcium chloride, 2-5 parts by weight of aluminum powder, 1-3 parts by weight of sodium thiosulfate, 3-5 parts by weight of aluminum chloride, 1-3 parts by weight of potassium carbonate and 5-12 parts by weight of bentonite into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination for 2-5 hours, cooling and crushing the mold, and putting the mold into a grinder for grinding the mold to an average particle size of 100-300 nm to obtain nano powder;
step 3, mixing preparation: according to parts by weight, mixing modified acrylic acid, nano powder, 12-25 parts of calcium lignosulphonate, 3-6 parts of butyl stearic acid and 3-7 parts of methyl cellulose, and uniformly stirring.
Preferably, in the step 1, the initiator is benzoyl peroxide, cumene hydroperoxide or tert-butyl peroxybenzoate.
Preferably, in the step 1, the heating reaction temperature is 65-85 ℃.
Preferably, in the step 2, the temperature of the high-temperature high-pressure calcination is 1050-1150 ℃.
Preferably, in the step 2, the pressure of the high-temperature high-pressure calcination is 350-500 MPa.
Preferably, in the step 2, the barium salt is one or more of barium sulfate, barium nitrate and barium chloride.
Advantageous effects
According to the invention, acrylic acid is chemically modified, and the nano filler is subjected to high-temperature solid-phase modification, so that various performances of cement are improved by utilizing the high polymer material and the nano material, the cement has more excellent workability and durability, and the water reducing property, the early strength property, the waterproof property, the antifreezing property and the expansion property are all obviously improved, therefore, the composite admixture provided by the invention is a very ideal concrete admixture.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Example 1
A preparation process of a concrete composite additive comprises the following steps:
step 1, preparing modified acrylic acid: according to the weight parts, 35 parts of acrylic acid, 5 parts of methacrylic acid, 5 parts of maleic anhydride, 21 parts of ethylene oxide, 5 parts of glycerol, 5 parts of trimethylolpropane, 5 parts of isocyanate, 3 parts of methyl methacrylate and 5 parts of bisphenol A are put into a reactor, 2 parts of benzoyl peroxide are added, the mixture is heated and reacted for 3 hours in a water bath, the temperature of the heating reaction is 65 ℃, and the modified acrylic acid is prepared after the reaction is finished;
step 2, preparing nano powder: according to the weight parts, 5 parts of barium sulfate, 5 parts of calcium chloride, 2 parts of aluminum powder, 1 part of sodium thiosulfate, 3 parts of aluminum chloride, 1 part of potassium carbonate and 5 parts of bentonite are placed in a mould, placed in a high-temperature furnace for high-temperature and high-pressure calcination at 1050 ℃ and 350MPa for 2 hours, cooled and crushed, and placed in a grinder for grinding until the average particle size is 100nm, so that nano powder is obtained;
step 3, mixing preparation: according to the weight portion, the modified acrylic acid, the nanometer powder, 12 portions of calcium lignosulphonate, 3 portions of butyl stearic acid and 3 portions of methyl cellulose are mixed and stirred evenly.
Example 2
A preparation process of a concrete composite additive comprises the following steps:
step 1, preparing modified acrylic acid: according to the weight parts, 55 parts of acrylic acid, 12 parts of methacrylic acid, 12 parts of maleic anhydride, 35 parts of ethylene oxide, 8 parts of glycerol, 10 parts of trimethylolpropane, 9 parts of isocyanate, 7 parts of methyl methacrylate and 15 parts of bisphenol A are put into a reactor, 5 parts of cumene hydroperoxide are added, the mixture is heated and reacted for 6 hours in a water bath, the temperature of the heating reaction is 85 ℃, and the modified acrylic acid is prepared after the reaction is finished;
step 2, preparing nano powder: according to the weight parts, 15 parts of barium nitrate, 12 parts of calcium chloride, 5 parts of aluminum powder, 3 parts of sodium thiosulfate, 5 parts of aluminum chloride, 3 parts of potassium carbonate and 12 parts of bentonite are placed into a mold, placed into a high-temperature furnace for high-temperature and high-pressure calcination at 1150 ℃ and 500MPa for 5 hours, cooled and crushed, and placed into a grinder for grinding until the average particle size is 300nm, so that nano powder is obtained;
step 3, mixing preparation: according to the weight portion, the modified acrylic acid, the nanometer powder, 25 portions of calcium lignosulphonate, 6 portions of butyl stearic acid and 7 portions of methyl cellulose are mixed and stirred evenly.
Example 3
A preparation process of a concrete composite additive comprises the following steps:
step 1, preparing modified acrylic acid: according to parts by weight, putting 37.5 parts of acrylic acid, 6.5 parts of methacrylic acid, 10 parts of maleic anhydride, 24 parts of ethylene oxide, 5.5 parts of glycerol, 6 parts of trimethylolpropane, 6 parts of isocyanate, 4 parts of methyl methacrylate and 7.5 parts of bisphenol A into a reactor, adding 2.5 parts of tert-butyl peroxybenzoate, heating in a water bath for 3.5 hours at the temperature of 70 ℃, and finishing the reaction to prepare modified acrylic acid;
step 2, preparing nano powder: according to the weight parts, 7.5 parts of barium chloride, 6.5 parts of calcium chloride, 2.5 parts of aluminum powder, 1.5 parts of sodium thiosulfate, 3.5 parts of aluminum chloride, 1.5 parts of potassium carbonate and 6.5 parts of bentonite are placed in a mould, placed in a high-temperature furnace for high-temperature and high-pressure calcination at 1075 ℃, 385MPa and 2.5 hours, cooled, crushed and placed in a grinder for grinding until the average particle size is 150nm, so that nano powder is obtained;
step 3, mixing preparation: according to the weight portion, the modified acrylic acid, the nanometer powder, 15 portions of calcium lignosulphonate, 3.5 portions of butyl stearic acid and 4 portions of methyl cellulose are mixed and stirred evenly.
Example 4
A preparation process of a concrete composite additive comprises the following steps:
step 1, preparing modified acrylic acid: according to the weight parts, 47.5 parts of acrylic acid, 10 parts of methacrylic acid, 10 parts of maleic anhydride, 31 parts of ethylene oxide, 7 parts of glycerol, 9 parts of trimethylolpropane, 8 parts of isocyanate, 6 parts of methyl methacrylate and 12 parts of bisphenol A are put into a reactor, 4 parts of benzoyl peroxide are added, the mixture is heated and reacted in a water bath for 5 hours, the temperature of the heating reaction is 70 ℃, and the modified acrylic acid is prepared after the reaction is finished;
step 2, preparing nano powder: according to the weight parts, 12 parts of barium sulfate, 10 parts of calcium chloride, 4 parts of aluminum powder, 2.5 parts of sodium thiosulfate, 4.5 parts of aluminum chloride, 2.5 parts of potassium carbonate and 10 parts of bentonite are placed in a mold, placed in a high-temperature furnace for high-temperature and high-pressure calcination at the temperature of 1125 ℃, the pressure of 460MPa and the calcination time of 4 hours, cooled, crushed and placed in a grinder for grinding to the average particle size of 250nm to obtain nano powder;
step 3, mixing preparation: according to the weight parts, the modified acrylic acid, the nanometer powder, 21 parts of calcium lignosulphonate, 5 parts of butyl stearic acid and 6 parts of methyl cellulose are mixed and stirred uniformly.
Example 5
A preparation process of a concrete composite additive comprises the following steps:
step 1, preparing modified acrylic acid: according to the weight parts, 40 parts of acrylic acid, 8 parts of methacrylic acid, 8 parts of maleic anhydride, 28 parts of ethylene oxide, 6.5 parts of glycerol, 7.5 parts of trimethylolpropane, 7 parts of isocyanate, 5 parts of methyl methacrylate and 10 parts of bisphenol A are put into a reactor, 3.5 parts of cumene hydroperoxide are added, the mixture is heated and reacted in a water bath for 4.5 hours, the temperature of the heating reaction is 75 ℃, the reaction is finished, and the modified acrylic acid is prepared;
step 2, preparing nano powder: according to the weight parts, 10 parts of barium nitrate, 8.5 parts of calcium chloride, 3.5 parts of aluminum powder, 2 parts of sodium thiosulfate, 4 parts of aluminum chloride, 2 parts of potassium carbonate and 8.5 parts of bentonite are placed in a mold, placed in a high-temperature furnace for high-temperature and high-pressure calcination at the temperature of 1100 ℃, the pressure of 425MPa and the calcination time of 3.5h, cooled and crushed, and then placed in a grinder for grinding to the average particle size of 200nm to obtain nano powder;
step 3, mixing preparation: according to the weight portion, the modified acrylic acid, the nanometer powder, 18.5 portions of calcium lignosulphonate, 4.5 portions of butyl stearic acid and 5 portions of methyl cellulose are mixed and stirred evenly.
Comparative example 1
The difference from example 5 is that: acrylic acid was not modified and was added directly.
Step 1, preparing nano powder: according to the weight parts, 10 parts of barium nitrate, 8.5 parts of calcium chloride, 3.5 parts of aluminum powder, 2 parts of sodium thiosulfate, 4 parts of aluminum chloride, 2 parts of potassium carbonate and 8.5 parts of bentonite are placed in a mold, placed in a high-temperature furnace for high-temperature and high-pressure calcination at the temperature of 1100 ℃, the pressure of 425MPa and the calcination time of 3.5h, cooled and crushed, and then placed in a grinder for grinding to the average particle size of 200nm to obtain nano powder;
step 2, mixing preparation: according to the weight portion, 40 portions of acrylic acid, 18.5 portions of nanometer powder, 18.5 portions of calcium lignosulphonate, 4.5 portions of butyl stearic acid and 5 portions of methyl cellulose are mixed and stirred evenly.
Comparative example 2
The difference from example 5 is that: the powder was not nano-modified.
A preparation process of a concrete composite additive comprises the following steps:
step 1, preparing modified acrylic acid: according to the weight parts, 40 parts of acrylic acid, 8 parts of methacrylic acid, 8 parts of maleic anhydride, 28 parts of ethylene oxide, 6.5 parts of glycerol, 7.5 parts of trimethylolpropane, 7 parts of isocyanate, 5 parts of methyl methacrylate and 10 parts of bisphenol A are put into a reactor, 3.5 parts of cumene hydroperoxide are added, the mixture is heated and reacted in a water bath for 4.5 hours, the temperature of the heating reaction is 75 ℃, the reaction is finished, and the modified acrylic acid is prepared;
step 2, mixing preparation: according to parts by weight, 10 parts of modified acrylic acid, 8.5 parts of barium nitrate, 3.5 parts of calcium chloride, 3.5 parts of aluminum powder, 2 parts of sodium thiosulfate, 4 parts of aluminum chloride, 2 parts of potassium carbonate, 8.5 parts of bentonite, 18.5 parts of calcium lignosulphonate, 4.5 parts of butyl stearic acid and 5 parts of methyl cellulose are mixed and stirred uniformly.
The concrete composite admixture prepared in the above examples and comparative examples was subjected to performance test according to the standard of "GB 8076-2008 concrete admixture":
first, the water-reducing property and water-proofing property of the composite admixture were tested, and the results are shown in table 1:
TABLE 1 Water-reducing and Water-repelling Properties of the examples and comparative examples
As can be seen from the above table, the water reducing performance and the waterproof performance of the embodiments 1 to 5 are significantly superior to those of the comparative examples 1 to 2, since the acrylic acid is modified, and the powder is nano-modified, it can be found that the acrylic acid is better in the water reducing performance and the waterproof performance after being modified, because the addition of the high polymer material forms a more compact structure inside the concrete, the water reducing performance and the waterproof performance are better, and meanwhile, because the addition of the nano powder, gaps in the concrete are smaller and smaller, and therefore, certain water reducing performance and certain waterproof performance are also improved.
Next, the compound admixture was tested for anti-freezing and expansion properties, and the results are shown in Table 2:
table 2 test of anti-freeze and expansion properties of examples and comparative examples
As can be seen from the above table, the antifreezing performance and the expansion performance of the concrete prepared in the examples 1 to 5 are significantly better than those of the comparative examples 1 to 2, and the toughness and the durability of the concrete prepared by modifying the acrylic acid and the powder are improved, so that the antifreezing performance and the expansion performance are excellent.
Finally, the composite admixture was tested for early strength performance, and the results are shown in table 3:
table 3 test of early strength properties of examples and comparative examples
The table shows that the early strength performance of the embodiments 1-5 is obviously superior to that of the comparative examples 1-2, and the early strength is obviously superior to that of the comparative examples and common concrete because the acrylic acid and the powder are modified and the strength of the concrete is rapidly improved after the acrylic acid and the powder are added into the concrete.
Claims (6)
1. The preparation process of the concrete composite admixture is characterized by comprising the following steps:
step 1, preparing modified acrylic acid: according to the weight parts, 35-55 parts of acrylic acid, 5-12 parts of methacrylic acid, 5-12 parts of maleic anhydride, 21-35 parts of ethylene oxide, 5-8 parts of glycerol, 5-10 parts of trimethylolpropane, 5-9 parts of isocyanate, 3-7 parts of methyl methacrylate and 5-15 parts of bisphenol A are put into a reactor, 2-5 parts of an initiator is added, water bath heating reaction is carried out for 3-6 hours, and modified acrylic acid is prepared after the reaction is finished;
step 2, preparing nano powder: putting 5-15 parts by weight of barium salt, 5-12 parts by weight of calcium chloride, 2-5 parts by weight of aluminum powder, 1-3 parts by weight of sodium thiosulfate, 3-5 parts by weight of aluminum chloride, 1-3 parts by weight of potassium carbonate and 5-12 parts by weight of bentonite into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination for 2-5 hours, cooling and crushing the mold, and putting the mold into a grinder for grinding the mold to an average particle size of 100-300 nm to obtain nano powder;
step 3, mixing preparation; according to parts by weight, mixing modified acrylic acid, nano powder, 12-25 parts of calcium lignosulphonate, 3-6 parts of butyl stearic acid and 3-7 parts of methyl cellulose, and uniformly stirring.
2. The process for preparing the concrete composite admixture according to claim 1, wherein: in the step 1, the initiator is benzoyl peroxide, cumene hydroperoxide or tert-butyl peroxybenzoate.
3. The process for preparing the concrete composite admixture according to claim 1, wherein: in the step 1, the heating reaction temperature is 65-85 ℃.
4. The process for preparing the concrete composite admixture according to claim 1, wherein: and in the step 2, the temperature of high-temperature high-pressure calcination is 1050-1150 ℃.
5. The process for preparing the concrete composite admixture according to claim 1, wherein: and in the step 2, the pressure of high-temperature and high-pressure calcination is 350-500 MPa.
6. The process for preparing the concrete composite admixture according to claim 1, wherein: in the step 2, the barium salt is one or more of barium sulfate, barium nitrate and barium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911346426.1A CN110937843A (en) | 2019-12-24 | 2019-12-24 | Preparation process of concrete composite additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911346426.1A CN110937843A (en) | 2019-12-24 | 2019-12-24 | Preparation process of concrete composite additive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110937843A true CN110937843A (en) | 2020-03-31 |
Family
ID=69913243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911346426.1A Pending CN110937843A (en) | 2019-12-24 | 2019-12-24 | Preparation process of concrete composite additive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110937843A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105802134A (en) * | 2016-04-17 | 2016-07-27 | 刘家容 | Method for preparing high-strength modified epoxy glass reinforced plastic |
| CN106477943A (en) * | 2016-10-21 | 2017-03-08 | 黄景珍 | A kind of composite cement admixture |
| CN107056138A (en) * | 2017-01-20 | 2017-08-18 | 北京紫瑞天成科技有限公司 | A kind of modified asphalt mixture |
| CN110436859A (en) * | 2019-08-22 | 2019-11-12 | 东营镐润环保科技有限公司 | A kind of preparation process of modified foam concrete square pile |
-
2019
- 2019-12-24 CN CN201911346426.1A patent/CN110937843A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105802134A (en) * | 2016-04-17 | 2016-07-27 | 刘家容 | Method for preparing high-strength modified epoxy glass reinforced plastic |
| CN106477943A (en) * | 2016-10-21 | 2017-03-08 | 黄景珍 | A kind of composite cement admixture |
| CN107056138A (en) * | 2017-01-20 | 2017-08-18 | 北京紫瑞天成科技有限公司 | A kind of modified asphalt mixture |
| CN110436859A (en) * | 2019-08-22 | 2019-11-12 | 东营镐润环保科技有限公司 | A kind of preparation process of modified foam concrete square pile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111153646A (en) | Seawater sea sand concrete material for 3D printing | |
| CN109337024B (en) | Preparation method of retarding polycarboxylate superplasticizer | |
| CN104016640B (en) | One is exempted from pressure and is steamed anticorrosion stake of high-performance and preparation method thereof | |
| CN110655369A (en) | Concrete and preparation method thereof | |
| CN108793905A (en) | A kind of mending mortar and preparation method thereof and the application in precast concrete repairing | |
| WO2024120065A1 (en) | Mine tailing-derived self-forming material and use thereof | |
| CN111732365A (en) | Concrete composite admixture and preparation method thereof | |
| CN102211913B (en) | Cement-based grouting material containing polyester type carboxylic acid water reducing agent and preparation method thereof | |
| CN114057425B (en) | Method for preparing polycarboxylic acid nanocrystalline core type early strength water-reducing complexing agent | |
| CN109437621B (en) | Environment-friendly portland cement and preparation method thereof | |
| CN113292273A (en) | Concrete composite additive and preparation method thereof | |
| CN104876529A (en) | Cold region used antifreezing concrete | |
| CN111978042A (en) | Environment-friendly composite quick-drying high-performance concrete | |
| CN109306021B (en) | Starch sulfate retarding superplasticizer and preparation method thereof | |
| CN115432989B (en) | Alkali-activated cementing material with low drying shrinkage and high compressive strength and preparation method thereof | |
| CN109053013B (en) | Concrete raw material, composite powder for concrete and preparation method thereof | |
| CN110937843A (en) | Preparation process of concrete composite additive | |
| CN114804704B (en) | Environment-friendly chlorine-free cement grinding aid and production method thereof | |
| CN110407501B (en) | Permeable concrete strong-effect agent | |
| CN113173728B (en) | Alkali-free accelerator for resisting aggregate alkali activity reaction and preparation method thereof | |
| CN110922106B (en) | Building waste recycled aggregate masonry mortar and preparation method thereof | |
| CN108864389B (en) | Preparation method of viscosity-reducing sulfamate water reducer | |
| CN112919862A (en) | Large-volume concrete and preparation method thereof | |
| CN111978057A (en) | Early-strength high-strength composite cementing material and preparation method thereof | |
| CN111548072A (en) | High-strength high-performance concrete and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200331 |